Passing under the diver’s arm also prevents the airline from getting snagged on things underwater. Or breaking off at the connection to the helmet if the line gets a sudden jerk due to waves acting on the support boat. The air hose connects to a valve, downward-facing, at the rear of the helmet. This valve is one-way so it allows air into the helmet and suit, but not out. This is set up so that if the air flow suddenly stops, the air trapped in the helmet and suit may be enough for the diver to ascend to the surface. The air flows into the helmet via a series of ducts that set up a swirling movement of air within the helmet. How Does Air Get Out of an Old Style Diving Helmet? This keeps the stale air away from the diver’s face. The air exits the diving helmet via an outlet valve. Depending on the type of suit and helmet, the outlet valve may be positioned on the helmet, usually on the right-hand side. Some of the old diving suits have the outlet valve on the chest plate.Īir is pumped into the suit, the diver breathes as required, and the air is exhausted out the outlet vale. This outlet valve is adjustable so the diver can regulate the airflow, and therefore the air quality, in the helmet. The adjustment of the outlet valve is a balance between the amount the surface pump can deliver, the quality of air in the suit and the amount of air needed in the suit to control the diver’s buoyancy. The SpitcockĪnother unique feature of the old-style diving helmets is the spitcock.
0 Comments
Leave a Reply. |